%0 Case Reports
%T Mucinous tubular and spindle cell carcinoma of the kidney: Report of a case with imprint cytologic features.
%A Otani M
%A Shimizu T
%A Serizawa H
%A Nagashima Y
%J Acta Cytol
%V 50
%N 6
%D Nov-Dec 2006
%M 17152283
%F 3
%R 10.1159/000326041
%X <B>BACKGROUND: </B>Mucinous tubular and spindle cell carcinoma of the kidney is a newly established subtype in the World Health Organization classification. The tumor has a good prognosis, and its diagnosis is clinically important. However, there are no reports of its cytologic features. Here we report the cytologic findings of this rare tumor.<BR><B>METHODS: </B>A 68-year-old female had left-sided abdominal pain, fatigue and hematuria. A large mass in the left kidney was removed. Histologically, the tumor was compatible with mucinous tubular and spindle cell carcinoma. Imprint cytologic examination revealed a large amount of tumor cells arranged in tubular, sheetlike and spindle structures. Some tumor cells showed clear cytoplasm. Nuclear atypia was mild, with occasional distinctive nucleoli.<BR><B>CONCLUSIONS: </B>The cytologic features of mucinous tubular and spindle cell carcinoma have a varied appearance. It should be included in the differential diagnosis to avoid overtreatment.